marie I've never seen anything like it.....
I have seen in the past though small shell builders in acro colonies that live in the acro structure however they never eat the coral skin like you described what they do is feed by casting a string and these are small like 2mm wide.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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